A172507 - cp's OEIS frontend

A172507 a(n) = numerator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form (n).(n).

n	a(n)
1	11
2	11
3	33
4	22
5	11
6	33
7	77
8	44
9	99
10	101
11	1111
12	303
13	1313
14	707
15	303
16	404
17	1717
18	909
19	1919
20	101
21	2121
22	1111
23	2323
24	606
25	101
26	1313
27	2727
28	707
29	2929
30	303

[11, 11, 33, 22, 11, 33, 77, 44, 99, 101, 1111, 303, 1313, 707, 303, 404, 1717, 909, 1919, 101, 2121, 1111, 2323, 606, 101, 1313, 2727, 707, 2929, 303]

cp's OEIS Frontend

A172507 a(n) = numerator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form (n).(n).

Table of values

List of values